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<head><meta charset="utf-8"><title>LLVM 12 regression · t-compiler/wg-llvm · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/index.html">t-compiler/wg-llvm</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html">LLVM 12 regression</a></h3>

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<a name="231750669"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/231750669" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Amanieu <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#231750669">(Mar 25 2021 at 05:45)</a>:</h4>
<p>FYI <a href="https://bugs.llvm.org/show_bug.cgi?id=49710">https://bugs.llvm.org/show_bug.cgi?id=49710</a> is currently causing <code>compiler-builtins</code> tests to fail.</p>



<a name="231799402"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/231799402" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#231799402">(Mar 25 2021 at 13:26)</a>:</h4>
<p>Could you please file a rust-lang/rust issue to track this as well?</p>



<a name="231802188"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/231802188" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Amanieu <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#231802188">(Mar 25 2021 at 13:44)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/83467">#83467</a></p>



<a name="233781760"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/233781760" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Amanieu <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#233781760">(Apr 09 2021 at 07:51)</a>:</h4>
<p>As a general rule, should we file a bug in rust-lang/rust for every LLVM 12 regression we find? I've found 3 already so far.</p>



<a name="233782549"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/233782549" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Amanieu <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#233782549">(Apr 09 2021 at 07:59)</a>:</h4>
<p><a href="https://bugs.llvm.org/show_bug.cgi?id=49904">https://bugs.llvm.org/show_bug.cgi?id=49904</a></p>



<a name="233793405"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/233793405" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#233793405">(Apr 09 2021 at 09:43)</a>:</h4>
<p>In general it's a good idea to do so, gives us a heads up and maybe it's an easy fix or workaround or tracks a backlog etc.</p>



<a name="234993396"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/234993396" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Caleb Zulawski <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#234993396">(Apr 17 2021 at 14:51)</a>:</h4>
<p>Not sure if it's necessary to post here, but I found one too: <a href="https://github.com/rust-lang/rust/issues/84268">#84268</a></p>



<a name="234996856"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/234996856" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#234996856">(Apr 17 2021 at 15:35)</a>:</h4>
<p>Doesn't look like <code>fabs</code>, the <code>fcmp oeq</code> gets optimized out to a constant <code>0</code> first.</p>



<a name="234996959"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/234996959" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#234996959">(Apr 17 2021 at 15:36)</a>:</h4>
<p>Ah, I guess see <span class="user-mention" data-user-id="133224">@Nikita Popov</span> 's comment on the PR too.</p>



<a name="234997060"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/187780-t-compiler/wg-llvm/topic/LLVM%2012%20regression/near/234997060" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/187780-t-compiler/wg-llvm/topic/LLVM.2012.20regression.html#234997060">(Apr 17 2021 at 15:38)</a>:</h4>
<p>Also, oh wow what a major bug ^^</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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